Standing on a balcony, you throw your keys to a friend standing on the ground below. One second after you release the keys, they have an instantaneous velocity of 13.9m/s, directed 45 below the horizontal. What initial velocity did you give them?
Please help me ASAP

There are three different equations:
Velocity=acceleration×time+ initial velocity
Position= 1/2 acceleration×time^2+initial position
Velocity^2 - initial velocity^2= 2×acceleration(position - initial position)
So you substitute or you can solve it by a system..

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Standing on a balcony, you throw your keys to a friend standing on the ground below. One second after you release the keys, they have an instantaneous velocity of 13.9m/s, directed 45 below the horizontal. What initial velocity did you give them? Please help me ASAP

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Standing on a balcony, you throw your keys to a friend standing on the ground below. One second after you release the keys, they have an instantaneous velocity of 13.9m/s, directed 45 below the horizontal. What initial velocity did you give them?
Please help me ASAP